I created and enabled a Master Password in Tools > Preferences > Security. I didn't enable the session password checkbox. Then I restarted the application.
My assumption was that WinSCP would reopen with a password prompt, blocking access to the main screen - however it does not. I am able to open WinSCP and access my various sites, no differently than before I enabled the Master Password.
Please help me understand the purpose of the Master Password. Thanks.
EDIT: Additional information - I use the KeePass plugin "KeeAgent" to authenticate ssh. Now I wonder if this somehow conflicts with or duplicates the intended function of the WinSCP Master Password.